clientSideBaseURI (environment variable CLIENT_SIDE_BASE_URI) for unusual cases where a custom domain is being used specifically for client-side SDK polling requests. This and other base URI options will never need to be set by most users.sdk.launchdarkly.com and clientsdk.launchdarkly.com instead of app.launchdarkly.com when making requests to certain LaunchDarkly endpoints. This has no effect on the Relay Proxy's functionality, but allows LaunchDarkly's load-balancing behavior to work more efficiently.Fetched April 11, 2026